A stationary thunderstorm caused isolated flash flooding in Tioga County.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS CTP wrote it up.
A stationary thunderstorm caused isolated flash flooding in Tioga County.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS State College, PA wrote its last area forecast discussion before the first event at Aug 30, 2:50 PM EST, 1 hour 15 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 350 PM EDT THU AUG 30 2007 .SYNOPSIS... A WEAK COLD FRONT MOVING THROUGH THE STATE IS TOUCHING OFF SCATTERED SHOWERS AND THUNDERSTORMS OVER CENTRAL PENNSYLVANIA. COOLER AIR BEHIND THE FRONT WITH COMFORTABLE HUMIDITY WILL REPLACE OUR CURRENTLY HUMID AIRMASS FOR ALL OF THE UPCOMING LABOR DAY WEEKEND. && .NEAR TERM /UNTIL 6 AM FRIDAY MORNING/... SCATTERED STORMS HAVE FIRED IN WEAK CONVERGENCE AHEAD OF FRONTAL BOUNDARY. SOME PULSING TO NEAR SEVERE LEVELS GIVEN MODERATE CAPE. WITH RIBBON OF MODERATE PWATS ALONG FRONTAL ZONE WILL LIKELY HAVE AN ACTIVE EVENING WITH SEVERAL HOURS OF MARGINAL STORMS TO INTERROGATE ON RADAR. && .SHORT TERM /6 AM FRIDAY MORNING THROUGH 6 PM FRIDAY/... SHOWERS AND ANY THUNDERSTORMS SHOULD DWINDLE QUICKLY THIS EVENING WITH LOSS OF LATE AUGUST HEATING. ANY BRIEF CLEARING TONIGHT...ESPECIALLY IN THE NORTH...WILL MOST LIKELY LEAD TO MORE STRATUS AND FOG ON FRIDAY MORNING. AFTER SUNRISE...WE SHOULD GET THE VERY DRY AIR ALOFT TO MIX DOWN AND BRING A MOSTLY SUNNY AFTERNOON. LEFT IN A LINGERING 30 POP FOR THE SERN COUNTIES FRI MORNING...AS GFS AND RELATED RSM MEMBERS OF THE 21Z SREFS WANT TO SLOW THE FRONT AS IT REACHES MD/DE. THIS SEEMS PLAUSIBLE...BUT DO NOT WANT TO TOTALLY BUY OFF ON THAT JUST YET...AS THE DOME OF HIGH PRESSURE MOVING IN FROM THE UPPER GREAT LAKES IS FAIRLY HEALTHY FOR LATE AUGUST AT 1027-1028MB/HPA. && .LONG TERM /FRIDAY NIGHT THROUGH THURSDAY/... A PERIOD OF DRY LATE-SUMMER WEATHER WILL BE IN STORE FOR FRIDAY NIGHT ONWARD. SATURDAY WILL FEATURE CLEAR SKIES WITH TEMPERATURES NEAR NORMAL. DEWPOINTS WILL DROP INTO THE 40S MAKING FOR A PLEASANT WEEKEND. IT SHOULD BE A GOOD WEEKEND TO GET AT THOSE OUTDOOR PROJECTS. DAILY MINIMUM AND MAXIMUM TEMPERATURES THROUGH THE PERIOD ARE FORECAST TO BE WITHIN A FEW DEGREES OF SEASONAL NORMALS. RETURN FLOW AROUND HIGH PRESSURE WILL BEGIN TO FUNNEL MOISTURE NORTH INTO THE LOWER OHIO VALLEY LATER MONDAY. A WEAK COLD FRONT MAY APPROACH PA FROM THE NORTH ON TUESDAY...BUT ANY WIDESPREAD SHOWER ACTIVITY FOR THE CWA SHOULD HOLD OFF UNTIL AFTER THIS FORECAST PERIOD. && .AVIATION /20Z THURSDAY THROUGH TUESDAY/... VFR CONDS WITH SCT MVFR CIGS THROUGH THIS EVENING AS SURFACE COLD FRONT CROSSES CENTRAL PA WITH SCATTERED TSRA. SHEAR IS WEAK BUT WIND GUSTS TO 40 KTS CAN BE ENCOUNTERED AT THE SFC WITH SOME OF THE STRONGER PULSE STORMS THROUGH 00Z TONIGHT. ANY CLEARING TONIGHT WILL YIELD ADDITIONAL FOG AND STRATUS SIMILAR TO THE PAST FEW MORNING WITH MVFR AND LCL IFR VSBYS...DIMINISHING BY 16Z FRI. REMAINDER OF THE PERIOD WILL FEATURE VFR CONDITIONS AS HIGH PRESSURE BUILDS INTO THE REGION FOR THE WEEKEND. THE ONLY EXCEPTION WILL BE SOME AREAS OF EARLY MORNING VALLEY FOG EACH DAY. && .CTP WATCHES/WARNINGS/ADVISORIES... NONE. && SYNOPSIS...DANGELO/GARTNER NEAR TERM...DEVOIR SHORT TERM...DEVOIR LONG TERM...DANGELO/GARTNER AVIATION...DEVOIR
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA 257 AM EDT THU AUG 30 2007 PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046-049>053- 056>059-063>066-310700- WARREN-MCKEAN-POTTER-ELK-CAMERON-NORTHERN CLINTON-CLEARFIELD- NORTHERN CENTRE-SOUTHERN CENTRE-CAMBRIA-BLAIR-HUNTINGDON-MIFFLIN- JUNIATA-SOMERSET-BEDFORD-FULTON-FRANKLIN-TIOGA-NORTHERN LYCOMING- SULLIVAN-SOUTHERN CLINTON-SOUTHERN LYCOMING-UNION-SNYDER-MONTOUR- NORTHUMBERLAND-COLUMBIA-PERRY-DAUPHIN-SCHUYLKILL-LEBANON-CUMBERLAND- ADAMS-YORK-LANCASTER- 257 AM EDT THU AUG 30 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. DANGELO
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE STATE COLLEGE PA 210 PM EDT THU AUG 30 2007 PAZ037-301915- TIOGA- 210 PM EDT THU AUG 30 2007 ...STRONG THUNDERSTORMS WILL AFFECT TIOGA COUNTY... AT 203 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 12 MILES SOUTH OF ADDISON TO 8 MILES WEST OF WELLSBORO...MOVING EAST AT 10 MPH. WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THESE STORMS...ALONG WITH BRIEF HEAVY RAINFALL. THESE STORMS WILL BE NEAR LEONARD HARRISON STATE PARK AROUND 215 PM...KEENEYVILLE AROUND 225 PM...WELLSBORO AROUND 230 PM...TIOGA JUNCTION...LAWRENCEVILLE...TIOGA...MORRIS AROUND 245 PM...TIOGA AROUND 250 PM AND MANSFIELD AROUND 315 PM. THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 6...ROUTE 15. FORECASTER: DEVOIR
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE STATE COLLEGE PA 413 PM EDT THU AUG 30 2007 PAZ017-302115- CLEARFIELD- 413 PM EDT THU AUG 30 2007 ...A STRONG THUNDERSTORM WILL AFFECT WESTERN CLEARFIELD COUNTY... AT 406 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 6 MILES SOUTHEAST OF DUBOIS...MOVING SOUTHEAST AT 5 MPH. WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THIS STORM...ALONG WITH VERY HEAVY RAIN. WATER MAY POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS. THIS STORM WILL BE NEAR GRAMPIAN AROUND 455 PM AND CURWENSVILLE AROUND 515 PM...AND WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...I-80 BETWEEN MILE MARKERS 100 AND 108. THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 119...ROUTE 219...ROUTE 322. FORECASTER: DEVOIR
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE STATE COLLEGE PA 421 PM EDT THU AUG 30 2007 PAZ024-025-034-302100- BEDFORD-BLAIR-CAMBRIA- 421 PM EDT THU AUG 30 2007 ...A STRONG THUNDERSTORM WILL AFFECT CENTRAL CAMBRIA...NORTHERN BEDFORD AND SOUTHWESTERN BLAIR COUNTIES... AT 419 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 5 MILES EAST OF PORTAGE...MOVING SOUTHEAST AT 5 MPH. WIND GUSTS TO 40 MPH AND HAIL UP TO DIME SIZE ARE POSSIBLE WITH THIS STORM. THIS STORM WILL BE NEAR NEWRY AROUND 450 PM AND SKI GAP AROUND 500 PM. THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES... I-99 BETWEEN MILE MARKERS 5 AND 25. THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 22...ROUTE 220. FORECASTER: TYBURSKI
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE STATE COLLEGE PA 422 PM EDT THU AUG 30 2007 PAZ018-019-026-027-302045- HUNTINGDON-MIFFLIN-NORTHERN CENTRE-SOUTHERN CENTRE- 422 PM EDT THU AUG 30 2007 ...STRONG THUNDERSTORMS WILL AFFECT MIFFLIN...NORTHEASTERN HUNTINGDON AND SOUTHWESTERN CENTRE COUNTIES... AT 415 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 7 MILES NORTHWEST OF BELLEFONTE TO 10 MILES NORTHEAST OF TYRONE...MOVING SOUTHEAST AT 20 MPH. WIND GUSTS TO 50 MPH AND SMALL HAIL ARE POSSIBLE WITH THESE STORMS. THESE STORMS WILL BE NEAR MILESBURG AROUND 430 PM...BELLEFONTE AROUND 435 PM...ZION AROUND 440 PM AND PINE GROVE MILLS AROUND 445 PM. THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES... I-80 BETWEEN MILE MARKERS 149 AND 162. THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 22/522... ROUTE 220...ALT ROUTE 220...ROUTE 322...ROUTE 322/22...ROUTE 522... STATE ROAD 26...STATE ROAD 45. FORECASTER: DEVOIR
The Binghamton radar (KBGM), 109 km away, was scanning. The volume nearest the first event began at 21:02 UTC.
1 flash flood. Local standard time, as filed.
Torrential thunderstorm rains of up to 2 inches in an hour caused the flooding the northbound lanes of Route 15 about 2 miles south of Blossburg in Tioga County.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2007Every state in 2007This day in weather historyWarnings in Pennsylvania, August 2007
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 50286.